> I'll do some measurements later this afternoon. This is an Ivy bridge cpu, so clflush (not clflushopt). With a cond_resched for every page I get: (Note these calls are every 10 seconds....) # tracer: function_graph # # CPU DURATION FUNCTION CALLS # | | | | | | | 0) # 3155.126 us | drm_clflush_sg [drm](); 1) # 3067.382 us | drm_clflush_sg [drm](); 2) # 3063.766 us | drm_clflush_sg [drm](); 3) # 3092.302 us | drm_clflush_sg [drm](); 0) # 3209.486 us | drm_clflush_sg [drm](); ------------------------------------------ 0) kworker-7 => kworker-319 ------------------------------------------ 0) # 3633.803 us | drm_clflush_sg [drm](); ------------------------------------------ 1) kworker-7 => kworker-319 ------------------------------------------ 1) # 3090.278 us | drm_clflush_sg [drm](); 2) # 3828.108 us | drm_clflush_sg [drm](); 3) # 3049.836 us | drm_clflush_sg [drm](); ------------------------------------------ 3) kworker-319 => kworker-7 ------------------------------------------ 3) # 3295.017 us | drm_clflush_sg [drm](); 3) # 3064.077 us | drm_clflush_sg [drm](); ------------------------------------------ 0) kworker-319 => kworker-7 ------------------------------------------ 0) # 3182.034 us | drm_clflush_sg [drm](); ------------------------------------------ 3) kworker-7 => kworker-319 ------------------------------------------ 3) # 3065.754 us | drm_clflush_sg [drm](); ------------------------------------------ 2) kworker-319 => kworker-7 ------------------------------------------ 2) # 3562.513 us | drm_clflush_sg [drm](); ------------------------------------------ 3) kworker-319 => kworker-7 ------------------------------------------ 3) # 3048.914 us | drm_clflush_sg [drm](); 3) # 3062.469 us | drm_clflush_sg [drm](); 3) # 3055.727 us | drm_clflush_sg [drm](); ------------------------------------------ 0) kworker-7 => kworker-319 ------------------------------------------ Without the cond_sched I suspect more of them are 3.0ms. Not really a significant difference. I guess the longer times are the scheduler looking for work? I don't understand the extra traces - I'm guessing they are process switch related. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
